you know, my daugther was rolling over the night she was born. that's kinda freakish, and a little scary, i didn't want her sleeping on her belly, but she'd get there somehow. but that's not actually helpful. sorry.
well all babies are different. out of my 4 they usually rolled consistantly at 2-4 mo. as for sight there vision is so blurry at first usually being in focas at about a foot or so in the begining. which will lengthen with age and devolopment.
My kids never rolled LOL Well, they do now but my first was so fat she never rolled as a baby and my second rolled at about 6 months. Do you mean like tell different shapes apart from the other like a pre-schooler? Or just get their vision fairly focused? I think my babes stop having that "newborn stare" (as we like to refer to it) at about 3 months